update release docs for 1.10.0 (#1028)

* update release docs

* Update docs/release-notes/index.md

---------

Co-authored-by: Fabrizio Ferri-Benedetti <fabri.ferribenedetti@elastic.co>

Author: SylvainJuge

docs/release-notes/index.md

@@ -30,6 +30,9 @@ To check for security updates, go to [Security announcements for the Elastic sta
 ## 1.10.0 [edot-java-1-10-0-release-notes]
 **Release date:** March 24, 2026
 
+The 1.10.0 release contains fixes for potential security vulnerabilities.
+Refer to our [security advisory](https://discuss.elastic.co/t/elastic-otel-java-1-10-0-security-update-esa-2026-22-ghsa-xw7x-h9fj-p2c7/385700) for more details.
+
 This release is based on the following upstream versions:
 
 * opentelemetry-javaagent: [2.26.1](https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases/tag/v2.26.1)